Yes, you can

A new study published by The Proceedings of the National Academy of Sciences found that a handful of behavioral shifts, if adopted in all American households, could result in an 8 percent reduction of our national greenhouse gas emissions with almost no effect on quality of life.

In a Green Inc. blog post on the study, New York Times reporter Elizabeth Rosenthal writes:

Indeed, as an environment reporter who travels frequently in Europe, I find that one of the obvious paradoxes of global environmental statistics is how American per capita emissions are two to three times that of Sweden or France, although Americans’ quality of life is certainly not two to three times better than that of a Swede or a Frenchman.

Rosenthal also points out that the study didn’t even consider the potential reductions to be found by changing one’s diet away from red meat and processed food and toward sustainably grown produce, sustainable fish and poultry.